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If you are talking about cutting out the postcard stamp area, and sticking them on an envelope or a package, I think it is the same in theory as cutting stamps that were stuck to a letter, unused, and glue them to another letter to use.

I am also trying to find if there is some restrictions, because if I can use the old postcards, that is unused postage. Postcard stamps can also be used in stamp collecting.

They can be used to stamp anything, such as letters. Stamps are like money and they have to add up to the current postage, that is all.

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12y ago

What else can I help you with?